Merge branch 'master' into release-0.21.0-rc2

.flowconfig

frontend/interfaces/icepick.js

frontend/interfaces/underscore.js

frontend/src/metabase/components/Value.jsx

frontend/src/metabase/css/components/mb_data_table.css

frontend/src/metabase/css/core/colors.css

frontend/src/metabase/css/core/scroll.css

frontend/src/metabase/css/index.css

frontend/src/metabase/css/query_builder.css

frontend/src/metabase/css/vendor.css

frontend/src/metabase/dashboard/components/grid/GridItem.jsx

frontend/src/metabase/lib/redux.js

frontend/src/metabase/lib/visualization_settings.js

frontend/src/metabase/meta/types/Dataset.js

frontend/src/metabase/meta/types/Query.js

frontend/src/metabase/query_builder/components/FieldName.jsx

...metabase/query_builder/components/TimeGroupingPopover.jsx

...query_builder/components/filters/DateOperatorSelector.jsx

...builder/components/filters/pickers/RelativeDatePicker.jsx

frontend/src/metabase/redux/metadata.js